<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>width test</title>
    <link rel="stylesheet" href="test.css">
</head>
<body>
    <div class="sences">
        <div class="layer-horizontal">
            <div class="cloud"></div>
            <div class="mountain"></div>
            <div class="background"></div>
            <div class="tree"></div>
        </div>
   </div>
</body>
</html>